The article presents the history of introduction and the condition of the introduced to the Kola Peninsula accessions of Pinus pumila (Pall.) Regel. Siberian dwarf pine has been introduced to the Polar-Alpine Botanical Garden and Institute several times since 1947. As at 2021, the collection contains 3 accessions of different origin and age: 2 accessions in the main territory in the town of Kirovsk in the Khibiny Mountains and 3 accessions on the experimental site in the town of Apatity in the flat foothills. All the plants were divided into 5 groups depending on their location and age. We assessed their vital condition, winter hardiness, abundance of pollen dispersion and seed production, the degree of Pineus cembrae infestation, measured their height, trunk diameter and needle length. Nonparametric Mann - Whitney, Kruskal -Wallis, Dunn’s tests in the Past 4 program were used to compare quantitative indicators. All the specimens are well-adapted to the conditions of the Kola Peninsula, have slight damage, are winter-hardy, and the degree of Pineus cembrae infestation is very low. The Siberian dwarf pine shrubs on the experimental site in Apatity produce pollen and seeds more abundantly and regularly, have a greater height, diameter and needle length compared to specimens in the main territory in Kirovsk.
This study evaluates the development of Crataegus maximowiczii when introduced to the Kola Peninsula. The paper presents the timing of the onset of phenological phases, morphometric indicators of inflorescences and flowers, fruits, features of seed reproduction. C. maximowiczii is a plant with an early onset and short growing season. C. maximowiczii has a short shoot growth period, a short prefloral period, annual flowering and fruiting. The studied specimens of C. maximowiczii plants were characterized by heterogeneous morphometric parameters of flowers and inflorescences. Specimens with a denser inflorescence are characterized by a greater number of flowers per inflorescence, specimens with small flower sizes form medium-sized inflorescences. The species specificity factor affects the morphometric characteristics of inflorescences. Fruiting indicators largely depended on external conditions, among which temperature and relative humidity of the air have little effect. Plants of C. maximowiczii, when introduced to the Kola Peninsula, can be classified as small-fruited. The highest germination capacity is possessed by the samples with average values of mass, which have undergone combined pre-sowing preparation. The relative humidity of the air during the growing season has a greater effect than the temperature regime on the values of the mass of seeds for a given species under conditions of introduction.
This paper presents phenological development of seven introduced species of the genus Crataegus L. in the Kola North. The studied hawthorn species are characterized by early onset of vegetation, short duration of linear growth of shoots and a short vegetation period. Timely completion of growth processes and lignification of shoots contribute to successful adaptation of Crataegus plants under the conditions of introduction. The authors study morphometric parameters of flowers and inflorescences, decorative qualities, size and density of the inflorescence, the number of flowers in the inflorescence, the diameter of the flowers. The most decorative species of Crataegus during flowering are selected. The plants of the studied hawthorns are characterized by the average duration of the prefloral period, annual / irregular flowering. The most decorative species during flowering are the ones with larger flowers and inflorescences: C . maximoviczii and C . dahurica . Species with a large number of flowers are characterized by a denser inflorescence. Species with smaller flowers form smaller inflorescences and vice versa. In the conditions of the Kola Subarctic, the number of flowers in the inflorescence depends mainly on the specific features. C . maximoviczii is recommended for gardening in northern cities.
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